40 



MISC. PUBLICATION 200, U. S. DEFT. OF AGRICULTURE 



Hills of South Dakota, Idaho, and Alaska; introduced in Michigan 

 (fig. 15). BROMUS PUMPELLIANUS var. TWEEDYI Scribn. Differing in 

 having lemmas more densely pubescent. 2t Alberta to Colorado. 



8. Bromus erectusHuds. Culms tuft- 

 ed, erect, 60 to 90 cm tall, slender; 

 sheaths sparsely pilose or glabrous; ligule 

 1.5 mm long; blades narrow, sparsely 

 pubescent; panicle 10 to 20 cm long, 

 narrow, erect, the branches ascending or 

 erect; spikelets 5- to 10-flowered; glumes 

 acuminate, the first 6 to 8 mm, the second 

 8 to 1 mm long ; lemmas 1 to 1 2 mm long, 

 glabrous or evenly scabrous-pubescent 

 over the back; awn 5 to 6 mm long. 

 21 ^ Established hi a few localities from 

 Maine to New York; also in Washington 

 and Alabama; introduced from Europe. 



9. Bromus suksdorfii Vasey. (Fig. 16.) 

 Culms 60 to 100 cm tall; panicle 7 to 12 

 cm long, the branches erect or ascend- 

 ing; spikelets about 2.5 cm long, longer 

 than the pedicels; first glume mostly 

 1 -nerved, 8 to 10 mm long, the second 

 3-nerved, 8 to 12 mm long; lemmas 



FIGURE 14. Bromus pumpellianus, XL (Umbach 453, Mont.) 



12 to 14 mm long, appressed-pubescent near the margin and 

 on the lower part of midnerve; awn 2 to 4 mm long. 01 Rocky 

 woods and slopes, Washington to the southern Sierra Nevada of 

 California. 



10. Bromus orcuttianus Vasey. (Fig. 17.) 

 Culms 80 to 120 cm tall, erect, leafy below, 

 nearly naked above, pubescent at and below 

 the nodes; sheaths pilose or more or less 

 velvety or sometimes glabrous; blades rather 

 short and erect; panicle 10 to 15 cm long, 

 narrow-pyramidal, the few rather rigid short 

 branches finally divaricate; spikelets about 

 2 cm long, not much flattened, on short pedicels; glumes 

 narrow, smooth, or scabrous, the first 6 to 8 mm long, acute, 

 1-nerved, or sometimes with faint lateral nerves, the second 8 to 10 

 mm long, broader, obtuse, 3-nerved; lemmas 10 to 12 mm long, 

 narrow, inrolled at margin, obscurely nerved, scabrous or scabrous- 



